import math
n,p=list(map(float,input().split()))
n=int(n)
a=[1]*(n+1)
nr=math.ceil(n**0.5)
for i in range(2,nr):
    for j in range(2,n//i+1):
        m=i*j
        if m <=n:
            a[i*j]+=1
b=[pow(1-p,k-1) for k in a[2:]]
print(sum(b))